It would be a better question to ask "Why did Mark Zuckerberg buy successful VR game companies and shut their games down?" (if you were having fun you wouldn't visit Horizon Worlds) or "Why did Zuckerberg damage a successful brand by renaming it?"
It's not about money, it's about power. The primary currency of power is deference and if one powerful person demonstrates they can take an action and get deference that action is appealing to other powerful people who want to prove they can to do the same.